Measurement of the $CP$ asymmetry in $B^{-}\to D_s^{-}{D}^0$ and $B^{-}\to D^{-}{D}^0$ decays

Abstract

The $CP$ asymmetry in $B^{-}\to D_s^{-}{D}^0$ and $B^{-}\to D^{-}{D}^0$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb${}^{-1}$, collected in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. The results are $A^{CP}(B^{-}\to D_s^{-}{D}^0)=(-0.4\pm 0.5\pm 0.5)\%$ and $A^{CP}(B^{-}\to D^{-}{D}^0)=(2.3\pm 2.7\pm 0.4)\%$, where the first uncertainties are statistical and the second systematic. This is the first measurement of $A^{CP}(B^{-}\to D_s^{-}{D}^0)$ and the most precise determination of $A^{CP}(B^{-}\to D^{-}{D}^0)$. Neither result shows evidence of $CP$ violation.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-007.html